Really? I hadn't considered your plan for a 3.5, and I like the sound of it, but you mean to say that you'd quote a 3.6 case, machined heads as you described, a set of 100 mm cyls and 3.6 na pistons for the same price as a new set of 3.4 p/c's? (Which cost, what, about $3100 or so?) I would think we'd be talking about at least double or more the cost for your build, and it would be financially out of the realm of possibility for most customers.

3.4 Ps & Cs retail for well over $4000. And yes the quote was the same either way.
I guess some Porsche owners have been so abused by shops that charge for the "mystery not the reality" that they struggle with the concept of a mechanic that offers quality work at a fair price.